[英]Trying to know when a window closes in a macOS Document based application
我試圖知道何時關閉窗口,我實現了以下代碼:
class ViewController: NSViewController, NSWindowDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let window: NSWindow? = view.window
window?.delegate = self
}
func windowWillClose(_ aNotification: Notification) {
print("windowWillClose")
}
}
不幸的是,什么都沒有發生,我該怎么辦?
文件: https : //developer.apple.com/documentation/appkit/nswindow/1419400-willclosenotification
PS我已經讀過這個問題,沒有找到解決方案: 在Swift中處理窗口的關閉事件
問題在於,window屬性將始終在viewDidLoadMethod內部返回nil。 您需要在viewWillAppear方法內設置委托:
class ViewController: NSViewController, NSWindowDelegate {
override func viewWillAppear() {
super.viewWillAppear()
view.window?.delegate = self
}
func windowWillClose(_ aNotification: Notification) {
print("windowWillClose")
}
}
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